Marionette duck



FIG. 1 is a perspective view of a marionette duck embodying the present design;

FIG. 2 is a top plan view;

FIG. 3 is an elevational view of the side of the marionette duck opposite that shown in FIG. 1;

FIG. 4 is a front elevational view; and

FIG. 5 is a rear elevational view. 

The ornamental design for a marionette duck, substantially as shown. 